4 Ways Your Brain Suffers When You Stop Working Out

Taking just two weeks off can make you feel like a weary, angry mess

A growing gut isn’t the only bad thing that happens when you skip your workouts.

“More brain cells are being activated when we exercise than when we’re doing anything else,” says John Ratey, M.D., an associate clinical professor of psychiatry at Harvard Medical School and author of Spark: The Revolutionary New Science of Exercise and the Brain.

Your mood may plummet.

Your body produces endorphins—hormones that make you feel good—when you exercise, along with other happiness-inducing chemicals like serotonin, dopamine, norepinephrine, endocannabinoids (our bodies’ own marijuana-like chemicals), and more, Dr. Ratey says.

What’s more, recent research in the New England Journal of Medicine suggests that working out sparks the production of proteins called myokines, which can help protect your brain from stress-induced depression.

So when you stop exercising, you miss out on the influx of these mood boosters, Dr. Ratey says. And you may end up feeling down as a result.

In fact, when 40 regular exercisers stopped working out for two weeks, they scored worse on a mood test that measured depression, tension, and anger than those who continued to work out, according to a study in Psychosomatic Medicine.

Your memory may falter.

When University of Maryland researchers scanned the brains of fit older athletes, they found that blood flow to the athletes’ brains—particularly to the hippocampus, a structure involved in learning and memory—dropped significantly after a 10-day exercise hiatus.

In this study, the reduced blood flow wasn’t linked to any declines in brain function, says study author Alfonso Alfini, Ph.D. But other research has linked less blood flow to the hippocampus to mild cognitive impairment and Alzheimer's disease, he says.

So if you stop working out, your gray matter may take a hit, potentially setting the stage for problems processing information and thinking critically.

You may have trouble concentrating.

A review of research published in the British Medical Journal concludes that even short bursts of exercise—10 to 40 minutes—lead to an immediate boost in concentration.

The boost is at least partly thanks to the increased blood flow to your brain. It may also relate to the higher levels of chemicals in your blood, like endorphins and certain hormones, that keep your brain on high alert, the researchers speculate.

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